Added a target for a host version of the dart executable.

runtime/bin/BUILD.gn

 # Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 
 declare_args() {
+  dart_third_party_base = "//dart/third_party"
+
   dart_io_support = false
 
-  # TODO(zra, jamesr): Remove this check once we start building boringssl for
-  # the fuchsia port.
-  if (!defined(is_fuchsia) || !is_fuchsia) {
-    dart_boringssl_path = "../../third_party/boringssl"
-  }
+  dart_no_fallback_root_certificates = false
 }
 
 
 resources_sources_gypi =
     exec_script("../../tools/gypi_to_gn.py",
                 [rebase_path("vmservice/vmservice_sources.gypi")],
                 "scope",
                 ["vmservice/vmservice_sources.gypi"])
 
 # Generate a resources.cc file for the service isolate without Observatory.
@@ skipping 239 matching lines @@
 }
 
 # A source set for the implementation of 'dart:io' library
 # (without secure sockets) suitable for linking with gen_snapshot.
 source_set("gen_snapshot_dart_io") {
   configs += ["..:dart_config",
               "..:dart_product_config",
               "..:dart_precompiler_config"]
 
   deps = [
-    "//third_party/zlib",
+    dart_third_party_base + "/zlib",

[zra, 2016/09/19 21:14:27]

As it turns out, in the Flutter engine build, zlib comes from
//third_party/zlib, and boringssl comes from //dart/third_party/boringssl. Sorry
that this is a bit of a mess =(

[P.Y.L., 2016/09/19 21:16:47]

LOL. How about I leave zlib alone for now and we all gather to come up with a
ling-term plan for this?

   ]
 
   custom_sources_filter = [
     "*_test.cc",
     "*_test.h",
     "builtin.cc",
     "builtin_common.cc",
     "builtin_gen_snapshot.cc",
   ]
   if (!is_mac && !is_ios) {
     # Dart tree uses *_macos.* instead of *_mac.*
     custom_sources_filter += [
       "*_macos.h",
       "*_macos.cc",
     ]
   }
   set_sources_assignment_filter(custom_sources_filter)
 
   defines = [ "DART_IO_SECURE_SOCKET_DISABLED" ]
 
   sources = io_impl_sources_gypi.sources + builtin_impl_sources_gypi.sources
   sources += [
     "io_natives.cc",
     "io_natives.h",
   ]
 
   include_dirs = [
     "..",
-    "//third_party"
+    dart_third_party_base,
   ]
 }
 
 source_set("libdart_embedder_noio") {
   configs += ["..:dart_config",
               "..:dart_product_config",
               "..:dart_precompiled_runtime_config"]
   deps = [
     "..:libdart",
     "../vm:libdart_platform",
@@ skipping 18 matching lines @@
     # Dart tree uses *_macos.* instead of *_mac.*
     custom_sources_filter += [
       "*_macos.h",
       "*_macos.cc",
     ]
   }
   set_sources_assignment_filter(custom_sources_filter)
 
   if (is_mac || is_ios) {
     libs = [
+      "CoreFoundation.framework",
+      "CoreServices.framework",
       "Security.framework",
     ]
   } else if (defined(is_fuchsia) && is_fuchsia) {
     defines = [
       "DART_IO_SECURE_SOCKET_DISABLED"
     ]
   } else {
     deps = [
-      rebase_path(dart_boringssl_path, "."),
+      rebase_path(dart_third_party_base + "/boringssl", "."),
     ]
+    if (is_linux && dart_no_fallback_root_certificates) {
+        defines = [
+          "DART_IO_ROOT_CERTS_DISABLED"
+        ]
+    }
   }
 
   sources = io_impl_sources_gypi.sources + builtin_impl_sources_gypi.sources
   sources += [
     "builtin_nolib.cc",
     "builtin_natives.cc",
     "io_natives.cc",
     "io_natives.h",
     "embedded_dart_io.cc",
     "embedded_dart_io.h",
     "log_android.cc",
     "log_linux.cc",
     "log_macos.cc",
     "log_win.cc",
     "log.h",
   ]
-  if (is_linux) {
-    sources += [ "../../third_party/root_certificates/root_certificates.cc"]
+
+  if (is_linux && !dart_no_fallback_root_certificates) {
+    sources += [ dart_third_party_base + "/root_certificates/root_certificates.cc"]
   }
 
   include_dirs = [
     "..",
-    "//third_party"
+    dart_third_party_base,
   ]
 }
 
 
 action("generate_snapshot_bin") {
   deps = [
     "../bin:gen_snapshot($host_toolchain)",
   ]
 
   vm_isolate_snapshot = "$target_gen_dir/vm_isolate_snapshot.bin"
@@ skipping 63 matching lines @@
   deps = [
     ":generate_snapshot_file",
   ]
 }
 
 if (defined(is_fuchsia) && is_fuchsia) {
   copy("hello_fuchsia") {
     sources = [ "../tests/vm/dart/hello_fuchsia_test.dart" ]
     outputs = [ "$root_out_dir/hello_fuchsia.dart" ]
   }
+}
 
-  executable("dart_no_observatory") {
-    configs += ["..:dart_config",
-                "..:dart_product_config",
-                "..:dart_precompiled_runtime_config",]
-    deps = [
+executable("dart_no_observatory") {
+  configs += ["..:dart_config",
+              "..:dart_product_config",
+              "..:dart_precompiled_runtime_config",]
+  deps = [
+    ":gen_resources_cc",
+    ":embedded_dart_io",
+    ":libdart_builtin",
+    "../vm:libdart_platform",
+    "..:libdart",
+    ":dart_snapshot_cc",
+    "../../pkg:pkg",  # Pull this out to top-level for a real SDK build.
+    dart_third_party_base + "/zlib",
+  ]
+
+  if (defined(is_fuchsia) && is_fuchsia) {
+    deps += [
       ":hello_fuchsia",
-      ":gen_resources_cc",
-      ":embedded_dart_io",
-      ":libdart_builtin",
-      "../vm:libdart_platform",
-      "..:libdart",
-      ":dart_snapshot_cc",
-      "../../pkg:pkg",  # Pull this out to top-level for a real SDK build.
-      "//third_party/zlib",
-    ]
-
-    defines = [
-      "NO_OBSERVATORY",
-    ]
-
-    sources = [
-      "main.cc",
-      "observatory_assets_empty.cc",
-      "vmservice_impl.cc",
-      "vmservice_impl.h",
-      "$target_gen_dir/resources_gen.cc",
-    ]
-
-    include_dirs = [
-      "..",
-      "//third_party",
     ]
   }
 
+  defines = [
+    "NO_OBSERVATORY",
+  ]
+
+  sources = [
+    "main.cc",
+    "observatory_assets_empty.cc",
+    "vmservice_impl.cc",
+    "vmservice_impl.h",
+    "$target_gen_dir/resources_gen.cc",
+  ]
+
+  include_dirs = [
+    "..",
+    dart_third_party_base,
+  ]
+}
+
+
+if (defined(is_fuchsia) && is_fuchsia) {
   action("generate_snapshot_test_dat_file") {
     snapshot_test_dat_file = "$root_gen_dir/snapshot_test.dat"
     snapshot_test_in_dat_file = "../vm/snapshot_test_in.dat"
     snapshot_test_dart_file = "../vm/snapshot_test.dart"
     inputs = [
       "../tools/create_string_literal.py",
       snapshot_test_in_dat_file,
       snapshot_test_dart_file,
     ]
 
@@ skipping 20 matching lines @@
     configs += ["..:dart_config",
                 "..:dart_product_config",
                 "..:dart_precompiled_runtime_config",]
     deps = [
       "..:libdart",
       ":libdart_builtin",
       ":embedded_dart_io",
       ":dart_snapshot_cc",
       ":generate_snapshot_test_dat_file",
       "../vm:libdart_platform",
-      "//third_party/zlib",
+      dart_third_party_base + "/zlib",
     ]
     include_dirs = [
       "..",
       "$target_gen_dir",
     ]
     defines = [
       "TESTING",
     ]
 
     vm_tests_list = exec_script("../../tools/gypi_to_gn.py",
@@ skipping 23 matching lines @@
     sources = [
       "run_vm_tests_fuchsia.cc"
     ]
     libs = [
       "launchpad",
       "magenta",
       "runtime",
     ]
   }
 }  # defined(is_fuchsia) && is_fuchsia